M24LR64E-R datasheet(88/140 Pages) STMICROELECTRONICS

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Command codes

M24LR64E-R

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Doc ID 022712 Rev 3

26.5

Read Multiple Block

When receiving the Read Multiple Block command, the M24LR64E-R reads the selected

blocks and sends back their value in multiples of 32 bits in the response. The blocks are

numbered from 00h to 1FFh in the request and the value is minus one (–1) in the field. For

example, if the “Number of blocks” field contains the value 06h, seven blocks are read. The

maximum number of blocks is fixed at 32 assuming that they are all located in the same

sector. If the number of blocks overlaps sectors, the M24LR64E-R returns an error code.

The Protocol_extension_flag should be set to 1 for the M24LR64E-R to operate correctly. If

the Protocol_extension_flag is at 0, the M24LR64E-R answers with an error code. The

Option_flag is supported.

Request parameters:

●

Request flags

●

UID (optional)

●

First block number

●

Number of blocks

Response parameters:

●

Sector security status if Option_flag is set (see Table 49)

●

N blocks of data

Table 47.

Read Multiple Block request format

Request

SOF

Request_

flags

Read

Multiple

Block

UID(1)

Gray color means that the field is optional.

First

block

number

Number

of blocks

CRC16

Request

EOF

8 bits

23h

64 bits

16 bits

8 bits

16 bits

Table 48.

Read Multiple Block response format when Error_flag is NOT set

Response

SOF

Response_

flags

Sector

security

status(1)

Gray color means that the field is optional.

Data

CRC16

Response

EOF

8 bits

8 bits(2)

Repeated as needed.

32 bits(2)

16 bits

Table 49.

Sector security status

Reserved for future

use. All at 0.

Password

control bits

Read / Write

protection bits

0: Current sector not locked

1: Current sector locked

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